There is a lot of information around about the bombing of Darwin during WW2. Apart from dropping bombs, the Japanese also did strafing runs, shooting up targets of opportunity.
At GZ you will see the Aviation Historical Society Aviation Workshop where they prepare and maintain aviation heritage items displayed throughout Darwin. This building was a Navy victualling yard during WW2. This was attacked during the first raid on 19 February 1942 and again on 25 March. A naval rating and civilian were killed and seven injured including six civilian workers.
If you look at the front door of this building, you can see some of the damage caused by the strafing (look where the arrows are pointing to on the sign).